JPS6335588B2 - - Google Patents
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- Publication number
- JPS6335588B2 JPS6335588B2 JP57210941A JP21094182A JPS6335588B2 JP S6335588 B2 JPS6335588 B2 JP S6335588B2 JP 57210941 A JP57210941 A JP 57210941A JP 21094182 A JP21094182 A JP 21094182A JP S6335588 B2 JPS6335588 B2 JP S6335588B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- cutting
- component
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 238000005520 cutting process Methods 0.000 claims description 21
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 238000001513 hot isostatic pressing Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 238000009472 formulation Methods 0.000 claims 2
- 238000002156 mixing Methods 0.000 claims 1
- 239000000654 additive Substances 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- -1 non-metallic steel Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Description
本発明は高密度で靭性の大きいAl2O3−TiC系
セラミツク工具材料の製造法に関する。
Al2O3−TiC系セラミツク工具は高速切削特性
に優れているため、近年高速切削において使用さ
れている。従来このようなセラミツク工具の製造
法として一般にホツトプレス法がもちいられてい
るが、これは角板又は円板を一度ホツトプレス
し、その後所望のチツプ形状に切断し、仕上げね
ばならず製造コストが高くなり、又チツプ形状が
複雑になると製造できないという難点がある。又
成形後一旦、不活性雰囲気中で焼結し密度を95％
程度にし、その後熱間静水圧プレスにより焼結す
るHIP法も提案されているが、不活性雰囲気中で
焼結する際に高温を要しそのため粒成長を伴うた
め、切削工具とした場合、耐摩耗性に劣るという
欠点がある。粒成長を抑制するためMgO、NiO
などを少量添加する試みもなされているが、この
場合でさえHIPを行うために必要な密度を得るた
めには1850℃以上の高温が必要であり、Al2O3の
粒成長はどうしてもさけられなかつた。
切削工具としての特性を十分に満足させうるた
めには一次焼結の温度を1750℃以下とし、Al2O3
の粒成長を防ぐ必要があるのである。
本発明の目的は、これらの問題を解決した切削
用セラミツク工具の製造方法を提供するもので、
その要旨は(a)Al2O355〜90重量％と、(b)TiO2を５
〜40重量％含むTiC成分10〜45重量％とから成る
配合物(c)100重量部に、(d)Tb4O3、HoO3、Er2O3
及びGd2O3から選ばれた一種以上を0.05〜3.0重量
部添加して混合し成型後、不活性ガス中で対理論
密度が95〜99％となるよう一次焼結を行い、次い
で熱間静水圧プレスを行い対理論密度を99.5％以
上とすることを特徴とする切削用セラミツク工具
の製造方法にある。
更に第二の発明として、上記組成物中の(c)成分
100重量部に対し、MgO、Y2O3、ZrO2、NiO及
びDy2O3から選ばれた一種以上を0.05〜3.0重量部
加えたものも同様に利用できる。
以下に本発明を詳細に説明するに、
本発明方法ではまず、(a)成分のAl2O3と(b)成分
のTiCとの配合物(c)を調製する必要がある。そし
て(b)成分のTiC成分にはTiOが５〜40重量％含ま
れている。TiO2はAl2O3とTiC成分の結合強度を
高め焼結体の硬さの向上を計るためのものである
が、(b)成分中に５重量％以下ではその効果に乏し
く、40重量％を超えるとAl2O3の粒成長が生じ逆
に強度の低下を伴うため５〜40重量％に限定し
た。
(a)成分と(b)成分の比率は従来から知られている
如く(a)成分70重量％、(b)成分30重量％が好まし
く、(a)成分が90重量％を超えると(b)成分の効果が
小さく靭性に劣り、(a)成分が55重量％未満では焼
結しにくく、空孔の残つた焼結体となるため、い
ずれも切削工具とした場合耐欠損性において不安
定となる。
(d)成分のTb4O7、Ho2O3、Er2O3及びGd2O3か
ら選ばれた一種以上（以下「第一添加物」と略称
する）を添加すると一次焼結の温度を1750℃以下
に低下し、粒成長を防ぐことができる。
(d)成分は第一添加物のみでも充分効果を発揮す
るが、更にMgO、Y2O3、ZrO2、NiO及びDy2O3
から選ばれた１種以上（以下「第二添加物」と略
称する）を配合物(c)100重量部に対し、0.05〜3.0
重量部添加すると、より強固な粒子の結合層が得
られるので好ましい。そして(d)成分は配合物(c)
100重量部に対し、0.05〜3.0重量部添加される
が、第一添加物、第二添加物のいずれかが0.05重
量部未満の場合はHIP処理するための一次焼結体
が1750℃では得られず、３重量部を超えると焼結
体は得られるが、靭性に劣り工具としての特性に
欠く。
上述の(a)成分と(b)成分を混合して配合物(c)を
得、更に(d)成分を添加して混合し、所定の形状に
成形したならば窒素ガス、アルゴンガス等の不活
性ガス中で対理論密度が95〜99％となるように温
度1600〜1750℃で一次焼結を行う。対理論密度を
この範囲になるように限定したのは、95％以下で
はHIP処理で緻密化が生じず、99％を超えると粒
成長が始まるためである。又一次焼結の温度をこ
の範囲で行うのは、1600℃以下ではHIPに必要な
一次焼結の密度95％以下とすることができず、
1750℃を超えると粒成長を起こし靭性及び耐摩耗
性を害するためである。
一次焼結後温度1300〜1450℃、圧力1000〜2000
Kg／cm2、時間10〜120分で熱間静水圧プレスを行
い、対理論密度を99.5以上とすると切削工具用焼
結体が完成し、これをダイヤモンド砥石等を用い
て切削工具に仕上げる。
以上のような本発明方法によつて得られるセラ
ミツク工具は耐摩耗性に優れたものとなる。その
理由はAl2O3とTiCの接着強度が高く、かつ
Al2O3の結晶粒子が微細なためである。
又本発明方法によつて得られたセラミツク工具
は鋳物以外の金属、例えば非金属、スチール等や
非金属の切削工具としても勿論使用でき、更には
振動が激しくかかる、あるいは高熱のかかる機械
部品にも使用することができる。
以下に本発明を実施例により更に詳細に説明す
るが、本発明はその要旨を超えない限り以下の実
施例により限定されるものではない。
実施例
純度99.9％平均粒径0.4μｍのα−Al2O3、炭素
量19.98％平均粒径1.1μｍのTiC粉、TiO2、第一
添加物、第二添加物を第１表のように各種配合
し、ボールミルにて40hr湿式混合を行つた後乾燥
し、混合粉を得た。この混合粉を1.0ton／cm2の圧
力で焼結後の寸法が13×13×５mmになるようプレ
ス成型し、その後150mmHgのアルゴン雰囲気で対
理論密度が95〜97％になるよう第２表に示す温度
で一次焼結した。焼結後HIP炉を用いて1400℃で
1hr、1500Kg／cm2の圧力で焼結した。ガスはアル
ゴンを用いた。得られた焼結体はダイヤモンド砥
石を用いてSNGN432の形状（JIS）に仕上げた。
チヤンフアーは0.07mm×25゜とした。このものに
ついて次の、の条件にて切削テストを行つた
ところ第２表のような結果が得られた。
切削テストの条件
被削材：FC20（HB200〜220）
切削条件：切削速度（Ｖ）＝920ｍ／min、
切り込み（ｔ）＝0.05mm、
送り速度(f)＝0.25mm／rev、
寿命判定：φ120×15mmの外周部を100回切削
した後の摩耗幅VB（mm）を測定
被削材：SKD11（HRC62）
切削条件：切削速度（Ｖ）＝100ｍ／min、
切り込み（ｔ）＝0.5mm、
送り速度(f)＝0.1mm／rev
寿命判定：120φmmの棒材を15分間切削した後
の摩耗幅VB（mm）を測定
The present invention relates to a method for manufacturing Al 2 O 3 --TiC based ceramic tool materials having high density and high toughness. Al 2 O 3 -TiC ceramic tools have been used in high-speed cutting in recent years because they have excellent high-speed cutting characteristics. Conventionally, the hot pressing method has been generally used as a manufacturing method for such ceramic tools, but in this method, a square plate or a circular plate must be hot pressed, then cut into the desired chip shape, and finished, resulting in high manufacturing costs. Another problem is that it is difficult to manufacture chips with complex shapes. After molding, it is sintered in an inert atmosphere to reduce the density to 95%.
A HIP method has also been proposed in which the sintering process is performed using hot isostatic pressing, but this method requires high temperatures when sintering in an inert atmosphere and is accompanied by grain growth, making it difficult to use as a cutting tool. It has the disadvantage of poor abrasion resistance. MgO, NiO to suppress grain growth
Attempts have been made to add small amounts of Al 2 O 3, but even in this case, a high temperature of 1850°C or higher is required to obtain the density required for HIP, and grain growth of Al 2 O 3 cannot be avoided. Nakatsuta. In order to fully satisfy the characteristics as a cutting tool, the primary sintering temperature should be 1750℃ or less, and Al 2 O 3
It is necessary to prevent grain growth. The purpose of the present invention is to provide a method for manufacturing a ceramic cutting tool that solves these problems.
The gist is (a) 55-90% by weight of Al 2 O 3 and (b) 5% of TiO 2
(d) Tb 4 O 3 , HoO 3 , Er 2 O 3
0.05 to 3.0 parts by weight of one or more selected from Gd 2 O 3 and Gd 2 O 3 are added and mixed, and after molding, primary sintering is performed in an inert gas so that the theoretical density becomes 95 to 99%, and then hot A method of manufacturing a ceramic tool for cutting, characterized by performing hydrostatic pressing to achieve a theoretical density of 99.5% or more. Furthermore, as a second invention, component (c) in the above composition
It is also possible to use a composition in which 0.05 to 3.0 parts by weight of one or more selected from MgO, Y 2 O 3 , ZrO 2 , NiO and Dy 2 O 3 is added to 100 parts by weight. To explain the present invention in detail below, in the method of the present invention, it is first necessary to prepare a blend (c) of Al 2 O 3 as the component (a) and TiC as the component (b). The TiC component (b) contains 5 to 40% by weight of TiO. TiO 2 is used to increase the bonding strength between Al 2 O 3 and the TiC component and improve the hardness of the sintered body, but if it is less than 5% by weight in component (b), its effect is poor; If it exceeds 5% by weight, grain growth of Al 2 O 3 occurs, which is accompanied by a decrease in strength, so the content is limited to 5 to 40% by weight. As is conventionally known, the ratio of component (a) to component (b) is preferably 70% by weight of component (a) and 30% by weight of component (b), and if component (a) exceeds 90% by weight, The effect of component (a) is small and the toughness is poor, and if the content of component (a) is less than 55% by weight, it is difficult to sinter, resulting in a sintered body with pores, resulting in unstable fracture resistance when used as a cutting tool. becomes. When one or more selected from component (d) Tb 4 O 7 , Ho 2 O 3 , Er 2 O 3 and Gd 2 O 3 (hereinafter referred to as "first additive") is added, the temperature of primary sintering increases. It is possible to reduce the temperature to below 1750℃ and prevent grain growth. As for component (d), the first additive alone exhibits sufficient effect, but in addition MgO, Y 2 O 3 , ZrO 2 , NiO and Dy 2 O 3
0.05 to 3.0 of one or more selected from the following (hereinafter referred to as "second additive") per 100 parts by weight of compound (c).
It is preferable to add it in parts by weight because a stronger binding layer of particles can be obtained. and (d) component is compound (c)
0.05 to 3.0 parts by weight are added to 100 parts by weight, but if either the first additive or the second additive is less than 0.05 parts by weight, the primary sintered body for HIP treatment cannot be obtained at 1750°C. If the amount exceeds 3 parts by weight, a sintered body can be obtained, but it is poor in toughness and lacks properties as a tool. The above-mentioned components (a) and (b) are mixed to obtain compound (c), and component (d) is added and mixed. After forming into a predetermined shape, it is heated with nitrogen gas, argon gas, etc. Primary sintering is performed in an inert gas at a temperature of 1600 to 1750°C so that the theoretical density is 95 to 99%. The reason why the theoretical density was limited to this range is that densification does not occur in HIP treatment when it is less than 95%, and grain growth begins when it exceeds 99%. Also, if the primary sintering temperature is within this range, it is impossible to achieve the primary sintering density of 95% or less required for HIP if the temperature is below 1600℃.
This is because if the temperature exceeds 1750°C, grain growth will occur, impairing toughness and wear resistance. After primary sintering temperature 1300~1450℃, pressure 1000~2000
Kg/cm 2 and hot isostatic pressing for 10 to 120 minutes to achieve a theoretical density of 99.5 or higher, a sintered body for a cutting tool is completed, and this is finished into a cutting tool using a diamond grindstone or the like. The ceramic tool obtained by the method of the present invention as described above has excellent wear resistance. The reason is that the adhesive strength between Al 2 O 3 and TiC is high, and
This is because the crystal grains of Al 2 O 3 are fine. Furthermore, the ceramic tool obtained by the method of the present invention can of course be used as a cutting tool for metals other than cast metals, such as non-metallic steel, etc., and can also be used as a cutting tool for mechanical parts that are subjected to intense vibration or high heat. can also be used. EXAMPLES The present invention will be explained in more detail by examples below, but the present invention is not limited to the following examples unless it exceeds the gist thereof. Example α-Al 2 O 3 with a purity of 99.9% and an average particle size of 0.4 μm, TiC powder with a carbon content of 19.98% and an average particle size of 1.1 μm, TiO 2 , the first additive, and the second additive as shown in Table 1. Various blends were mixed, wet mixed in a ball mill for 40 hours, and then dried to obtain a mixed powder. This mixed powder was press-molded at a pressure of 1.0 ton/cm 2 so that the dimensions after sintering were 13 x 13 x 5 mm, and then in an argon atmosphere of 150 mmHg, the theoretical density was adjusted to 95 to 97% as shown in Table 2. Primary sintering was performed at the temperature shown in . After sintering at 1400℃ using HIP furnace
Sintering was carried out at a pressure of 1500 Kg/cm 2 for 1 hr. Argon was used as the gas. The obtained sintered body was finished into the shape of SNGN432 (JIS) using a diamond grindstone.
The chamfer was set to 0.07 mm x 25°. When this material was subjected to a cutting test under the following conditions, the results shown in Table 2 were obtained. Cutting test conditions Work material: FC20 (HB200~220) Cutting conditions: Cutting speed (V) = 920m/min, Depth of cut (t) = 0.05mm, Feed rate (f) = 0.25mm/rev, Life judgment: φ120 Measure the wear width V B (mm) after cutting the outer circumference of ×15 mm 100 times Work material: SKD11 (HRC62) Cutting conditions: Cutting speed (V) = 100 m/min, depth of cut (t) = 0.5 mm, Feed rate (f) = 0.1mm/rev Life judgment: Measure the wear width V B (mm) after cutting a 120φmm bar for 15 minutes
【表】【table】
【表】【table】
【表】【table】
Claims (1)
含むTiC成分10〜45重量％とから成る配合物100
重量部に、Tb4O7、Ho2O3、Er2O3及びGd2O3か
ら選ばれた一種以上を0.05〜3.0重量部添加して
混合し成形後、不活性ガス中で対理論密度が95〜
99％となるように一次焼結を行い、次いで熱間静
水圧プレスを行い対理論密度を99.5％以上とする
ことを特徴とする切削用セラミツク工具の製造方
法。 ２ Al2O355〜90重量％と、TiO2を５〜40重量％
含むTiC成分10〜45重量％とから成る配合物100
重量部に、Tb4O7、Ho2O3、Er2O3及びGd2O3か
ら選ばれた一種以上を0.05〜3.0重量部とMgO、
Y2O3、ZrO2、NiO及びDy2O3から選ばれた一種
以上を0.05〜3.0重量部添加して混合し成形後、
不活性ガス中で対理論密度が95〜99％となるよう
に一次焼結を行い、次いで熱間静水圧プレスを行
い対理論密度を99.5％以上とすることを特徴とす
る切削工具用セラミツク工具の製造方法。[Claims] 1 55 to 90% by weight of Al 2 O 3 and 5 to 40% by weight of TiO 2
A formulation consisting of 10-45% by weight of TiC component containing 100
0.05 to 3.0 parts by weight of one or more selected from Tb 4 O 7 , Ho 2 O 3 , Er 2 O 3 and Gd 2 O 3 are added to the parts by weight, mixed, and after molding, the mixture is heated in an inert gas. Density is 95~
A method for manufacturing a ceramic tool for cutting, characterized by performing primary sintering to obtain a density of 99%, followed by hot isostatic pressing to obtain a theoretical density of 99.5% or more. 2 55-90% by weight of Al 2 O 3 and 5-40% by weight of TiO 2
A formulation consisting of 10-45% by weight of TiC component containing 100
0.05 to 3.0 parts by weight of one or more selected from Tb 4 O 7 , Ho 2 O 3 , Er 2 O 3 and Gd 2 O 3 and MgO,
After adding and mixing 0.05 to 3.0 parts by weight of one or more selected from Y 2 O 3 , ZrO 2 , NiO and Dy 2 O 3 and molding,
A ceramic tool for cutting tools, characterized in that the ceramic tool is primarily sintered in an inert gas so that the theoretical density becomes 95 to 99%, and then hot isostatic pressing is performed to achieve a theoretical density of 99.5% or more. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57210941A JPS59102864A (en) | 1982-12-01 | 1982-12-01 | Manufacture of ceramic cutting tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57210941A JPS59102864A (en) | 1982-12-01 | 1982-12-01 | Manufacture of ceramic cutting tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59102864A JPS59102864A (en) | 1984-06-14 |
| JPS6335588B2 true JPS6335588B2 (en) | 1988-07-15 |
Family
ID=16597618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57210941A Granted JPS59102864A (en) | 1982-12-01 | 1982-12-01 | Manufacture of ceramic cutting tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59102864A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6436513B2 (en) * | 2015-06-17 | 2018-12-12 | 国立研究開発法人物質・材料研究機構 | Oxidation-induced self-healing ceramic composition containing a healing activator, its production method and use, and method for enhancing the function of oxidation-induced self-healing ceramic composition |
-
1982
- 1982-12-01 JP JP57210941A patent/JPS59102864A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59102864A (en) | 1984-06-14 |
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